gruntfile.js

// Gruntfile with the configuration of grunt-express and grunt-open. No livereload yet!
module.exports = function(grunt) {

    // Load Grunt tasks declared in the package.json file
    require('matchdep').filter('grunt-*').forEach(grunt.loadNpmTasks);
    
    // Configure Grunt 
    grunt.initConfig({
        //pkg: grunt.file.readJSON('package.json'),
        //can use <%= pkg.name %> etc to access package.json attributes.
        
        // grunt-watch will monitor the projects files
        watch: {
            all: {
                files: ['public/js/**/*.js', 'public/css/**/*.css', 'views/**/*.ejs'],
                options: {
                    livereload: true
                }
            }
        },
        
        concat: {
            options: {
                separator: ';'
            },
            libjs: {
                src : ['public/libs/jquery*.js', 'public/libs/**/*.js'],
                dest : 'public/js/libs.js'
            },
            libcss: {
                src : ['public/libs/**/*.css'],
                dest : 'public/css/libs.css'
            }
        },
        
        uglify : {
            libjs : {
                src: ['public/js/libs.js'],
                dest: 'public/js/libs.min.js'
            }
        },
        
        cssmin : {
            libcss : {
                src: ['public/css/libs.css'],
                dest: 'public/css/libs.min.css'
            }
        }
    });
    
    grunt.registerTask('default', ['concat:libjs', 'concat:libcss', 'uglify:libjs', 'cssmin:libcss', 'watch']);
};

package.json

{
  "name": "application-name",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node app"
  },
  "dependencies": {
    "express": "3.0.0rc5",
    "ejs": "*",
	"grunt": "*",
	"matchdep": "*",
	"grunt-contrib-watch": "*",
    "grunt-contrib-concat": "*",
    "grunt-contrib-uglify": "*",
    "grunt-contrib-cssmin": "*"
  }
}